Pump light in the fiber easily formed under the effect of high power density, resulting in a laser level laser working substance "inversion." When a positive-feedback loop (form resonant cavity) will form a laser oscillation. As the fiber matrix has wide fluorescence spectrum of fiber laser tunable in general can be made in order for WDM systems. Fiber laser cavity [1] There are two major design categories. One is a common laser Fabry-Perot cavity. The gain medium placed in the two high-reflectivity mirrors the middle of the composition. As the media mirror the shortcomings of the fiber end face is very sensitive and easily cover the mirror is damaged, the current fiber laser cavity design, not the use of medium containing the cavity mirror structure. With green laser pointer, teachers can effectively control the computer all around the classroom.
Pump source of fiber length of 3cm, pull the thin fiber length of 15cm, pigtail output of 15cm. After the continuous spectrum in the output section of standard telecom fiber Raman pulses, tunable wavelength range of 200nm, Raman pulse wavelength tuning range of 1400nm ~ 1600nm. Pulse spectral bandwidth of 20nm, the equivalent width 130fs pulse sideband limit. When changing the input incident power, the Raman soliton wavelength is changed. This is to change the pump laser power to change the wavelength. And to Figure 1 for the Raman fiber laser pump source, conventional single-mode fiber resulting in a continuous spectrum [4], 0dBm wavelength tuning range was 93nm, the output wavelength range of 1434 ~ 1527nm, far less than the special fiber produced by a continuous spectrum. 100mW green laser pointer possesses the function of the laser pen.
A wide wavelength range from vacuum ultraviolet, visible to far infrared. The most important of which carbon dioxide 50mW green laser pointer, which is characterized by high efficiency, about 10% to 25% range, you can get high laser power, continuous output power up to megawatt pulse output of the device up to million joules per pulse level. This laser operates in the 9.4 micron and 10.4 micron multi-center vibrational spectrum of molecules line. Ordinary low-pressure carbon dioxide laser is divided into sealed-off lasers, horizontal and vertical air circulation-type lasers, horizontal atmospheric pressure and high pressure continuous tuning lasers, waveguide lasers and other laser and pneumatic. These lasers can be used for processing and handling (such as welding, cutting and heat treatment), optical communications, ranging, isotope separation and high temperature plasma research. 200mW green Laser Pointer integrates the functions like electronic pointer, laser pen, wireless mouse, and wireless keyboard so on.
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